noun
Seibu Shinjuku Line
Proper noun referring to a specific railway line operated by Seibu Railway in the Tokyo area.
西武新宿線は、西武新宿駅から本川越駅までを結んでいる。
The Seibu Shinjuku Line connects Seibu-Shinjuku Station with Hon-Kawagoe Station.
Compound of 西武 (Seibu, the railway company name) + 新宿 (Shinjuku, a major district in Tokyo) + 線 (line).